Leviticus 7:3-5

New Century Version

³ He must offer all the fat from the penalty offering—the fat tail, the fat that covers the inner organs, ⁴ both kidneys with the fat that is on them near the lower back muscle, and the best part of the liver, which is to be removed with the kidneys. ⁵ The priest must burn all these things on the altar as an offering made by fire to the Lord. It is a penalty offering.